Process for the manufacture of 1-bromoalkyl hydrocarbyl carbonat

Details Process for the manufacture of 1-bromoalkyl hydrocarbyl carbonat Process for the manufacture of 1-bromoalkyl hydrocarbyl carbonat

1991-11-21

1993-04-13

Dees, Jose G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbonate esters

558270, 558271, 558275, C07C 6996

Patent

active

052024547

ABSTRACT:
The invention relates to a new process for the preparation of 1-bromoalkyl hydrocarbyl carbonates.
The carbonates according to the invention are prepared by reacting an alpha-chlorinated carbonate of formula ##STR1## with an anhydrous brominated compound of formula ZBr in which Z represents hydrogen, the group (CH.sub.3).sub.3 -Si-, the group ##STR2## or bromine if R.sub.2 is other than an aromatic radical, in the presence of a catalyst chosen from the group consisting of heteroaromatic amines, quaternary ammonium or phosphonium halides, hexasubstituted guanidinium halides, alkaline earth metal halides or alkali metal halides in combination with a complexing agent for their cation.
The carbonates according to the invention find their preferential applications as blocking agents for some antibiotics or as agents for the synthesis of phosphorus-containing carbonates which can be used as insecticides.

REFERENCES:
patent: 2553518 (1951-05-01), Lake et al.
patent: 4426391 (1984-01-01), Alexander et al.
patent: 4697032 (1987-09-01), Malfroot et al.
Kirk-Othmer, Encyclopedia of Chemical Technology, 2nd revised edition, pp. 775 and 779, 1964.

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